I sent my 2008 sierra 78 mm single turbo to get 4l80 swapped and it ran for too days and the 3 day it got stuck in 2 nd gear and didn't want to shift and parked it and turned it off and turned back on and nos doesn't have reverse or neutral and doesn't have and gear

 

Was the trans freshly rebuilt ? was the PCM reprogrammed ?

 

Yeah yeah it was freshly rebuild , I scanned it with computer and it said it didn't have any psi

 

front pump could have took a ****.

 

Valve body. May have put check ball in wrong spot